Two stiffnesses of plastic are used to provide rigidity and flexibility for mountaineering and ice-climbing. The soft Pebax shell will not stiffen up in cold weather, and the inner liner features a warm, lace-up liner.

Rigid boots with defined toe and heel welts can use compatible step-in crampons or any other type of crampon. Rigid boots with a heel welt but no toe welt can use hybrid crampons or strap-on crampons. Semi-rigid boots can use strap-on crampons only.

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